The High-Resolution X-Ray Spectrum of MR 2251–178 Obtained with the Chandra HETGS
The High-Resolution X-Ray Spectrum of MR 2251–178 Obtained with the Chandra HETGS
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DOI：
10.1086/430199
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发表时间：
2005-07
期刊：
影响因子：
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通讯作者：
R. Gibson;H. Marshall;C. Canizares;Julia C. Lee
中科院分区：
文献类型：
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作者：
R. Gibson;H. Marshall;C. Canizares;Julia C. Lee
类星体MR 2251-178是用钱德拉高能透射光栅光谱仪（HETGS）在2-10 keV的光度为2.41 × 1044尔格·秒-1（使用H 0 = 72 km·秒-1 Mpc-1）下观测到的。我们在相对较低的状态下观察源。光变曲线没有显示出变异性的证据。我们给出了MR 2251-178的零级图像，并将其与以前的观测结果进行了比较。我们发现了一个高度电离的，高速流出的证据，我们检测到一个解决Fe XXVI Lyα吸收线。外流似乎有一个大的质量和动能通量相比，估计的核吸积率和光度。我们研究的可能性，光谱中的其他吸收功能与高速外流。我们探测到一条窄的Fe Kα线，并分辨出Ne IX和O VII的禁戒线发射。对发射材料进行建模使我们能够限制其属性，并得出结论，它不在我们的视线沿着。
The QSO MR 2251-178 was observed with the Chandra High Energy Transmission Grating Spectrometer (HETGS) at a 2-10 keV luminosity of 2.41 × 1044 ergs s-1 (using H0 = 72 km s-1 Mpc-1). We observe the source in a relatively low state. The light curve shows no evidence of variability. We present the zero-order image of MR 2251-178 and compare it to previous observations. We find evidence of a highly ionized, high-velocity outflow, which we detect in a resolved Fe XXVI Lyα absorption line. The outflow appears to have a large mass and kinetic energy flux compared to the estimated nuclear accretion rate and luminosity. We examine the possibility that other absorption features in the spectrum are associated with the high-velocity outflow. We detect a narrow Fe Kα line and resolved forbidden line emission from Ne IX and O VII. Modeling the emitting material enables us to constrain its properties and conclude that it is not along our line of sight.